IBM 7220, Instruction Manual

Page: 92 / 155

6-16
Chapter 6, COMPUTER OPERATION
AXO Auto-Offset
The X and Y output offsets are turned on and set to levels giving zero X and Y
outputs. Any changes in the input signal then appear as changes about zero in the
outputs.
EX [n] Output expansion control
Expands X and/or Y outputs by a factor of 10. Changes meter, CH1 and CH2
outputs full-scale to ±10 % if X or Y selected. The value of n has the following
significance:
n Expand mode
0 Off
1 Expand X
2 Expand Y
3 Expand X and Y
CH n
1
[n
2
] Analog output control
Defines what outputs appear on the rear panel CH1 and CH2 connectors according
to the following table:
n
2
Signal
0 X %FS
1 Y %FS
2 Magnitude %FS
3 Phase 1:- +9 V = +180°, -9 V = -180°
4 Phase 2:- +9 V = 360°, - 9 V = 0°
5 Noise %FS
6 Ratio:- (1000 × X)/ADC 1
n
1
is compulsory and is either 1 for CH1 or 2 for CH2
6.4.05 Instrument Outputs
X[.] X output
In fixed point mode causes the lock-in amplifier to respond with the X demodulator
output in the range ±30000, full-scale being ±10000.
In floating point mode causes the lock-in amplifier to respond with the X demodulator
output in volts or amps.
Y[.] Y output
In fixed point mode causes the lock-in amplifier to respond with the Y demodulator
output in the range ±30000, full-scale being ±10000.
In floating point mode causes the lock-in amplifier to respond with the Y demodulator
output in volts or amps.